Autoimmune Hemolytic Anemia in Children
55 cartesCase study and overview of autoimmune hemolytic anemia (AIHA) in a pediatric patient, including diagnosis, classification, and pathophysiology.
40 cartes
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What is AIHA?
Réponse
AIHA is an immune-mediated destruction of red blood cells, leading to hemolytic anemia.
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How is AIHA classified by etiology?
Réponse
AIHA can be primary (idiopathic) or secondary to infections, drugs, autoimmune diseases, or malignancies.
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What is warm AIHA?
Réponse
Warm AIHA is primarily IgG-mediated, often seen in children, and active above 37°C.
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What is cold AIHA?
Réponse
Cold AIHA is IgM-mediated and involves complement activation.
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Name a complication of severe anemia.
Réponse
Severe anemia can lead to hypoxia and heart failure.
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How does AIHA affect the kidneys?
Réponse
AIHA can cause acute kidney injury due to hemoglobinuria.
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What are key signs of AIHA?
Réponse
Jaundice and scleral icterus are key signs of AIHA.
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What urinalysis results suggest AIHA?
Réponse
Dark, red-brown urine with blood, protein, and urobilinogen indicates AIHA.
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What indicates acute anemia in lab tests?
Réponse
An Hb of 6.3 g/dL indicates acute anemia.
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Which lab finding suggests increased RBC destruction?
Réponse
Elevated LDH and unconjugated bilirubin suggest increased RBC destruction.
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What is a positive DAT result in AIHA?
Réponse
A positive DAT (Coombs) test for IgG and C3 confirms AIHA.
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What RBC morphology is seen in AIHA?
Réponse
Blood smear shows spherocytes and schistocytes in AIHA.
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What antibodies are involved in AIHA?
Réponse
The immune system produces autoantibodies against red blood cell antigens in AIHA.
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What is the primary antibody in warm AIHA?
Réponse
IgG antibodies are the primary type in warm AIHA.
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What is the mechanism of RBC destruction in AIHA?
Réponse
IgG antibodies bind to RBCs, leading to macrophage recognition and extravascular hemolysis.
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Where are RBCs primarily destroyed in warm AIHA?
Réponse
RBCs are primarily destroyed in the spleen (extravascular hemolysis) in warm AIHA.
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What happens to RBCs after partial phagocytosis?
Réponse
After partial phagocytosis, RBCs circulate as spherocytes until sequestered in the spleen.
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Name a risk factor for AIHA.
Réponse
Recent infection or drug exposure can be a risk factor for AIHA.
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How does immune system immaturity relate to AIHA?
Réponse
Immune system immaturity in children is a risk factor for AIHA.
QuestionRetourner la carte
What triggers can lead to AIHA?
Réponse
Viral or bacterial triggers can lead to AIHA.
QuestionRetourner la carte
What is AIHA?
Réponse
AIHA is an immune-mediated destruction of red blood cells, leading to hemolytic anemia.
QuestionRetourner la carte
How is AIHA classified by etiology?
Réponse
AIHA can be primary (idiopathic) or secondary to infections, drugs, autoimmune diseases, or malignancies.
QuestionRetourner la carte
What is warm AIHA?
Réponse
Warm AIHA is primarily IgG-mediated, often seen in children, and active above 37°C.
QuestionRetourner la carte
What is cold AIHA?
Réponse
Cold AIHA is IgM-mediated and involves complement activation.
QuestionRetourner la carte
Name a complication of severe anemia.
Réponse
Severe anemia can lead to hypoxia and heart failure.
QuestionRetourner la carte
How does AIHA affect the kidneys?
Réponse
AIHA can cause acute kidney injury due to hemoglobinuria.
QuestionRetourner la carte
What are key signs of AIHA?
Réponse
Jaundice and scleral icterus are key signs of AIHA.
QuestionRetourner la carte
What urinalysis results suggest AIHA?
Réponse
Dark, red-brown urine with blood, protein, and urobilinogen indicates AIHA.
QuestionRetourner la carte
What indicates acute anemia in lab tests?
Réponse
An Hb of 6.3 g/dL indicates acute anemia.
QuestionRetourner la carte
Which lab finding suggests increased RBC destruction?
Réponse
Elevated LDH and unconjugated bilirubin suggest increased RBC destruction.
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What is a positive DAT result in AIHA?
A positive DAT (Coombs) test for IgG and C3 confirms AIHA.
What RBC morphology is seen in AIHA?
Blood smear shows spherocytes and schistocytes in AIHA.
What antibodies are involved in AIHA?
The immune system produces autoantibodies against red blood cell antigens in AIHA.
What is the primary antibody in warm AIHA?
IgG antibodies are the primary type in warm AIHA.
What is the mechanism of RBC destruction in AIHA?
IgG antibodies bind to RBCs, leading to macrophage recognition and extravascular hemolysis.
Where are RBCs primarily destroyed in warm AIHA?
RBCs are primarily destroyed in the spleen (extravascular hemolysis) in warm AIHA.
What happens to RBCs after partial phagocytosis?
After partial phagocytosis, RBCs circulate as spherocytes until sequestered in the spleen.
Name a risk factor for AIHA.
Recent infection or drug exposure can be a risk factor for AIHA.
How does immune system immaturity relate to AIHA?
Immune system immaturity in children is a risk factor for AIHA.
What triggers can lead to AIHA?
Viral or bacterial triggers can lead to AIHA.
Teste ta compréhension
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Which substance is elevated in the blood due to increased red blood cell destruction?
Which organ is primarily responsible for the destruction of antibody-coated red blood cells in warm AIHA?
What urine finding is characteristic in AIHA?
What does a positive Direct Antiglobulin Test (DAT) for IgG and C3 indicate?
Which type of AIHA is most common in children?
What is the primary cause of Autoimmune Hemolytic Anemia (AIHA)?
What is a potential complication of severe anemia in AIHA?
What is the typical body temperature in warm AIHA?
What laboratory finding is highly indicative of AIHA?
What is the definition of hemolytic anemia?
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